cl. The pressure of the atmosphere. 



(This subject, Air, is continued in the work for 



the seventh grade.) 



WATER. VI. 



47. A brief summary of the facts stated under the 



same topic in the work for the fifth grade. 



48. The capacity of different soils for water. 



Experiment 44. The effect of texture 

 upon the water capacity of soils. 



49. How to increase the moisture-holding capacity of 



soils. 

 Experiment 45. The effect of tilling. 



50. Moisture of the soil. 



a. Its importance to the soil. 



b. The amount used by plants. 



c. The amount lost. 



51. Conservation of moisture of the soil. 



a. Tilling. 



b. Mulching. 



Experiment 46. Conservation of moist- 

 ure, 



52. The effect of water upon the surface of the earth. 



a. Erosion. 



b. Effect of freezing. 



53. How seeds obtain water. 



Experiment 47. Osmosis. 



54. Water can exert force. 



Experiment 48. Water pressure. 



55. Buoyancy a force. (See Section 101.) 



a. Floating bodies. 



b. Bodies which sink. 



Experiment 49. Buoyancy. 



